Indicator for inclosed fuses.



R. G. COLE.

INDICATOR FOE INGLOSED FUSES.

I I APPLICATION FILED JUNE 10, 1911.

Patented Oct. 1, 1912.

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To all whom it may conch-n) Be it known that l, ROBERT GHArLEs Conn, a citizen of the United States, residing at West Hartford, in the countyv of Hartford and State of Connecticut, have invented a new and useful Improvement in Indicators for Inclosed Fuses, of which the following E a specification.

This invention relates to a method of ggnstructing an indicating inclosed electric It is common practice to so connect a fine indicator wire between the terminals of an inclosed' electric fuse, that, yvhen the main fuse is blown by an overload or short circuit, the heat generated. by the current which passesthrough the indicator wirewill effect the disruption of the latter or-will. cause a discoloration of a spot,- or a portion of the fuse label, 'or will ignite a small quantity of inflammable material which will discolor or fracture the label or spot, for the purpose of visually indicating the fact that the main fuse has been disrupted. In order to efiectually accomplish this, it has been customary to drill very small holes through the tubular fiber casing usually employed, and to thread the fine indicator Wire through these small holes, so that the active portion of the wire will lie onor near the outer surface of the casing. The holes through which the wire is thus threaded must of necessity be very small so that dangerous flame and filling material will not be blown through them whenlthe fusible strip is disrupted. The

' expense of drilling these small holes in the fiber tube which is ordinarily used as the 'inclosing case, and threading the very fine indicator Wire through such holes, has been large in proportion to the cost of constructin the rest of the fuse.

'llheobject of this invention is to so coni struct the casing and simplify the method of :reduce t applyin the indicator wire as to materially he cost of manufacture and at the 7 same time increase the reliability of such as usual of a fiber tu fuses. I a

Flgure l of the accompanying drawings is a side view of an inclosed'eiectric fuse which embodies this invention. -Fi 2 shows: a central longitudinalsection o the same. i

The -casing o'f the fuse illustrated is made I jOn' and closing.

the ends. of this tubular resinare the me- 1: $p ecific'etiton of letters IF atom. ,Appiication filed June 10, .1911. SerlalNo. 832,483.

tallic ferrules 2, to. which it customary to electrically connect the ends i. .he fusible member 3. Granular filling material may or may not as preferred'be, placed in the casing about the fusible member.

In carrying out this invention, three holes are punched in the side of the; fiber'tube, one

near each end and one between, desirably near the middle. The fine indicator Wire-4 is run alon the inside of thecasing'. An eyewhen the main fuse is blown, the tighter will the hole be closed. In the intermediate hole, adwcent to the indicator wire, it is desirable to place a disk or pellet 6 of infiam mable material,- which may or may not be attached to the label '7 that is applied to the -tubular casing over this hole. The ends of the indicator wire are passed through the holes punched near the ends of the casing and are secured therein by eyelets 8 which are forced into, the holes from the outside. These eyelets, beside closin the holes and securing the ends of the in icator wire, in sure electrical connection between the indicator wire and the terminal ferrules which close the ends of the casing.

A fuse constructed in this manner is cheap to manufacture, for the three holes may be I of considerable size and can be rapidly punched by common machinery. The eyelets may be inserted by a suitable machine and wheninserted they close the openings and at the same time retain the indicator wire in a suitable manner; When the main fuse blows, and the current is diverted through the indicator wire, that wire becomes heaj-ied and ignites the inflammable materiallwhich burns or discolors' the label.

The invention claimed is:

1. An inclosed fuse having a tubular cas ing with an opening through one side, an

imperforate eyelet with a closed outer end forced from the interior into and closin said opening, and an indicator wire extend in alon the interior of the casin and t: e a

' 'cator wire extending along the interior of y the ca'sing'and over the exterior surface of ingwith three openings in one side, an indiforced'by said eyelet into the opening so that a section of said wire passes across the exterior of the closed end of the eyelet.

2.. Aninclosed fuse having atubular cas ing with an opening through one side, an imperforate eyelet with a closed'outer end forced from the interior into and closing said opening, an 'indicator wire extending along the interior of the casing and forced by said eyelet into the opening so a section of said wire passes across the exterior of the closed end of the eyelet, and material adapted to undergo a change when the indicator Wire becomes heated, located in said opening in contact with the exterior section .of the wire. 4

3. An inclosed fuse having a tubular casing with an opening through one side, an eyelet with a flanged inner edge, and a'closed outer end forming a closure for said opening through the side of'the tube, and an indithe eyelet.

at. An nclosed fuse having a tuhular casbinding the ends of the indicator .wire, and an eyelet inserted into the intermediate opening from the interior and forcing the indicator wire into said intermediate opening.

5. An inclosed fuse having a tubular cas-,

ing with three openings through its side,

an indicator wire extending along the in- 'terior and having its ends extending through the end openings, eyelets inserted from the interior into the end openings and binding the ends of the indicator wire, and

eyelet inserted from the interior into the intermediate openin and forcing said indicator wire into 't'e intermediate opening, and metallic end caps closing the ends of gsaidpasing and engaging the eyelets in the end openings.

H [ROBERT CHARLES COLE.

I Witnesses! Joenrnmn -Smurrnn,

HARRY R. -I'LLIAMB.

:Qiipies of this patent may be obtained'for five cents.

= .s on, 20 0.?

Washingt each, addressing tlie Commissioner of Patents. 

